Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover the safety profile (non-read-only, non-destructive, non-idempotent); the description adds real context beyond them: the list is created empty, is personal rather than group-scoped, and is shareable by link. It does not mention what happens on a duplicate name or whether only a name is configurable at creation, which are the remaining behavioral gaps.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, front-loaded with what gets created, followed by the sibling routing hint. No filler and no repetition of the title or annotations.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a single-parameter creation tool with annotations covering safety and no output schema to explain, the description supplies everything an agent needs: scope, emptiness at creation, shareability, and where the pre-existing group list lives instead.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, but there is only one parameter whose shape is fully constrained in the schema (1–100 chars). The description adds meaning by showing an example human-readable value ("Birthday"), making clear the name is a user-facing label rather than an identifier.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ("Creates a new, empty personal wishlist") and scopes it as personal, with a concrete example ("Birthday"). It also pre-empts confusion with the group wishlist, which is the closest-looking sibling behavior.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly tells the agent that the group list already exists and that list_my_wishlists is the tool for finding it, which implicitly routes list-creation-vs-list-lookup decisions. It stops short of naming create_wishlist_group as the alternative for group creation, so the exclusion is inferred rather than stated.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.